In this paper it is first shown that if M is a 2-dimensional
surface, then M(m) is orientable if and only if M is orientable.
Using the Macdonald\u27s result [5].
the Betti numbers of M(m) are expressed explicitely,
the Euler characteristic is found and it depends only on m
and the Euler characteristic of M.
Moreover, the formula for the Euler characteristic is proved alternatively also without using the Macdonalds\u27s results